CATALOG OF ORIGINAL DESCRIPTIONS: Dicarinella takayanagii Hasegawa 1999

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> D -> Dicarinella -> Dicarinella takayanagii
Other pages this level: D. elata, D. jekeliana, D. longoriai, D. radwanskae, D. sudetica, D. takayanagii,

Dicarinella takayanagii

Citation: Dicarinella takayanagii Hasegawa 1999
Rank: Species
Type locality: Oyubari area, Hokkaido, Japan; (43° 2.60'N; 142° 9.73'E)
Type age: Uppermost Cenomanian
Type sample and level: sample SRN 223, lower part of the Takinosawa Formation
Holotype Repository: Tohoku, Japan; Institute of Geology & Paleontology, Tohoku University, Sendai, Japan
Type & figured specimens: Figs 8/1-4; Holotype IGPS No.102515; paratypes IGPS No. 102513, 102514, 102516.
Description on pages: 186-7

Current identification/main database link: Dicarinella takayanagii Hasegawa 1999


Original Description
Diagnosis.- A low trochospiral species of Dicarinella with wedge-shaped chambers in last whorl and small umbilicus.

Description.-Test of medium to large size, low trochospiral, equatorial periphery lobulate; chambers initailly globigerine-like, later ones becoming wedge-shaped and flat on dorsal side, triangular and inflated in shape on ventral side, about 10 chambers in all, enlarging rapidly in size as added, about 4.5 chambers in last whorl, with widely separated weak double peripheral keels, one of which is shifted toward spiral side; final chamber diagnostically elongated in spiral direction, occasionally lacking peripheral keels; sutures on dorsal side gently curved, raised with keels that are continuous to one of peripheral keels, sutures on ventral side radial and depressed; umbilicus shallow and narrow, its width about 1/4 of maximum diameter of test; primary aperture bordered by a distinct lip, interiomarginal, umbilical-extraumbilical; wall calcareous, earlier chambers weakly pustulated.

Size: Maximum diameter of holotype 0.29 mm, maximum thickness 0.17 mm.

Extra details from original publication
Remarks.- This species is distinguished from other species of Dicarinella in possessing wedge- shaped chambers in the last whorl on the dorsal side, spirally elongated final chamber and a narrower umbilicus.

References:

Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Planktonic foraminiferal biostratigraphy and assemblage composition across the Cenomanian–Turonian boundary interval at Clot Chevalier (Vocontian Basin, SE France). Cretaceous Research. 59: 69-97. gs

Hasegawa, T. (1999). Planktonic foraminifera and biochronology of the Cenomanian-Turonian (Cretaceous) sequence in the Ohyubari area, Hokkaido, Japan. Paleontological Research. 3: 173-192. gs


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Dicarinella takayanagii compiled by the pforams@mikrotax project team viewed: 16-12-2019

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